Edit your server defs via Tools | Internet options | Sending/Receiving | Edit | Security.

<p> Just upgraded from 4.21c to 4.63, no apparent problems. </p><p>BUT  the only encryption choice I see in outgoing mail/encryption is (as with 4.21c) "built-in encryptor" which I assume is CRAM-MD5, as I got an email from my domain host telling me I'm using that and it will soon cease to work on their SMTP server.</p><p>How to I configure 4.63 to use TLS?</p> <p>Thanks! </p>